JPS6121297A - Freely rotatable drilling apparatus for drilling ground hole - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] 10.Objective A of the Invention, Industrial Application Field This application is related to sewerage management construction (excavation of small diameter pipes), telephone, electric cable burying (excavation of railways, road crossings, etc.), and tunnel construction. The present invention relates to a rotatable underground hole excavation device suitable for excavating bi-roof construction and the like.

B. Conventional technology and its problems As shown in Fig. 1, the conventional double pipe drilling equipment is
A rotating inner tube 2 through which rotational force is transmitted is supported inside the outer tube 1, and a rotary excavation blade 3 fixed to the tip of the inner tube 2 by means such as welding is protruded from the tip of the outer tube 1, and the above-mentioned excavation is carried out. The outer diameter of the blade 6 is made larger than the outer diameter of the outer tube 1, and this rotary excavating blade 6
While excavating underground earth and sand by zero rotation, the outer tube 1 is moved forward while being suppressed to prevent the excavation from progressing. As mentioned above, in order to facilitate the suppressed entry of the outer tube 1, the rotary excavating blade 6 must be made larger than the inner diameter of the outer tube 1. If it is worn and damaged, when you try to replace it, you will not be able to pull out only the rotating inner tube from outer tube 1, and
At the same time, the entire piece must be pulled out, and as a result, the extraction process requires considerable time and effort. In addition, there is a risk that the hole drilled for the entire extraction process will collapse, and furthermore, it will take a lot of effort to repair and replace the rotary inner pipe 2 and the rotary drilling blade 6, and due to the interruption of work, the original hole The drawback was that it took a long time to reach the bottom.

10 Configuration of the Invention Means for Solving the A0 Problem The present invention is constructed as follows as a means to solve the above-mentioned problem.

In other words, the diameter can be expanded by attaching a rotatable excavation bit and moving it forward in the excavation direction, and the diameter can be reduced by retreating.As a result, the diameter expansion and contraction movement is easy by pushing and pulling, and there is no need to attach or remove the bit to change it. There is no problem, and since the linear bit moves at right angles to the diameter line, the linear bit is configured to expand in diameter beyond the outer circumferential surface of the outer tube.Furthermore, there are bit receivers on the left and right of the linear bit storage groove of the rotating ring. A body stopper is installed to increase the excavation strength and allow for excavation that can be rotated left and right.

B1 Embodiment of the Invention In view of these various circumstances, the present invention has been developed to enable excavation with a hole diameter equal to or larger than that of the outer tube 1, and by providing the bit receiver stopper 7 shown in FIG. The linear motion bit 5 shown in FIG. 5 is fully received, and the drilling blades 6, 6'' are welded to the left and right sides of the upper part of the linear motion bit 5 shown in FIG. It provides bits. This will be explained in detail with reference to Fig. 2 and below. The drilling bit consists of an inner pipe 2 connected to a rotary ring body 4 shown in Fig. 2 formed of a metal material in a circular ring shape, and an outer pipe 2. In order to maintain a constant gap with the tube 1 and to ensure smooth rotation, an inner tube circumferential side wall row 215 is installed, and a desired plurality of rings 12 detachably connected to the rotary ring 4 act to reduce the diameter. By moving the inner tube 2 shown in FIG. 4 forward while holding it, the tip 8 of the linear motion bit shown in FIG. The linear motion bit 5 is accommodated in the bit receiver stoppers 7 on both sides of the linear motion bit storage groove 9 via the linear motion bit 5 . When the excavation blade body 6 rotates clockwise due to the rotation of the ring body 4, the left side of the linear bit 5 is received on the left side of the bit receiving stopper 7 in FIG. 5, and the excavation blade body 6 works. In the case of counterclockwise rotation, the right side surface of the direct-acting bit 5 is received on the right side of the bit receiving stopper 7, and the excavating blade body 6° works to enable digging. Therefore, since this device can freely rotate left and right, wear and damage to the excavating blade bodies 6 and 6 degrees shown in FIG. 5 is extremely small. In the case of direct-acting bit replacement, when the rotary excavation work is stopped and the inner tube 2 is pulled out, the bit tip 8 shown in FIG. The diameter is also reduced. Furthermore, a direct-acting bit stopper 16 provided at the bottom of the bit is used to maintain a constant diameter reduction.

(2) Effects of the invention (1) The linear motion bit can freely expand and contract in diameter due to the push and pull action.

B. By providing a bit receiver stopper, continuous excavation is possible with free left and right rotation.

C. Since the excavator blade has both left and right edges, it can withstand continuous excavation work for long periods of time and doubles work efficiency.

2. Bits can be attached and detached freely.

E. It is economical and suitable for saving costs.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the main part of an excavation rig equipped with a conventional rotary excavation blade, and FIG. Fig. 6 is a front view showing the expanded diameter state of the direct-acting drilling bit, and Fig. 4 is a front view showing the reduced diameter state of the direct-acting drilling bit, with a partially unfolded section cut away. FIG. 110. Outer tube, 2801 rotating inner tube, 4106 rotating ring,
501. Directional bit, 6.6°06. Drilling blade body, 7. . , bit receptor stopper, 801. Tip of linear bit, 916. Direct motion bit storage groove. Procedural amendment 1981 7 Chishu 3 days

Claims (1)

[Claims] A desired plurality of linear motion bit storage grooves are provided on the circumferential side wall of the rotating ring body at predetermined intervals, and linear motion bit receiving stoppers are further provided on the left and right sides of the storage grooves on the circumferential plane of the rotating ring body. , an underground hole rotation characterized in that a desired plurality of linear motion bits are attached to each linear motion bit storage groove in a axially connected manner to a linear motion shaft, and the linear motion bits are stored in the linear motion bit storage groove. Flexible drilling equipment.